The McAlpine S12A-F BSP Coupling Flush Spigot is a plumbing fitting designed to connect two pipes together. The "S12A-F" in the description refers to the specific model of the coupling, which is manufactured by McAlpine, a UK-based company that specializes in plumbing and drainage products. The term "BSP" in the description stands for British Standard Pipe, which is a type of threading used in the UK for connecting pipes and fittings. The coupling is designed with a flush spigot, which means that one end of the coupling fits inside a pipe while the other end has a smooth, flush surface that makes it easy to connect to another fitting or pipe. Overall, this type of coupling is commonly used in plumbing applications where a secure, leak-free connection is required. The McAlpine S12A-F BSP Coupling Flush Spigot is made from high-quality materials and is designed to provide reliable performance over an extended period of time. ・ Available in 1¼" and 1½" sizes ・ Used to convert European wastes to UK size ・ Manufactured in Polypropylene